Headphone



FIG. 1 is a perspective view of a headphone showing the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an opposite side elevational view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the figures illustrate portions of the design thatform no part of the claimed design.

CLAIM The ornamental design for a headphone, as shown and described.